The protagonist of Dreamkiller, the spiritual sequel to Painkiller. Alice, who was almost certainly named after the Alice from Alice in Wonderland, has an unusually high control over her own dreams, which is handy because before she discovered that she was plagued by especially terrible nightmares. She eventually discovered this control went so far as to allow her to enter the dreams of others, and have definitive impact on their minds.
Despite her trying-way-too-hard-to-be-edgy appearance, Alice is a trained psychologist, and the game technically depicts her at work: she uses her ability to enter the dreams of her most troubled patients, in order to set their minds right by literally killing their 'inner demons'. For example, the first level represents the mind of the ironically named Jonathan Web, a man with an all-consuming fear of spiders; the dreamscape takes the appearance of an abandoned zoo overrun with gigantic spiders and their webs.
The dream-state Alice killing the dream monsters is probably some kind of metaphor for removing the issues they represent from the patient's mind, but it's a mostly mindless first-person-shooter, so you don't really have to worry about that.
She has a totally awesome hand tattoo, which glows when she shoots fire. She is voiced by Laura Bailey, who also voiced Rayne from the BloodRayne series.